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Key January 2026 Tax Deadlines for Businesses

The arrival of January 2026 signals important tax deadlines for businesses, employers, farmers, and fishermen. Proactive planning is crucial to ensure compliance and avoid penalties.

January 15 - Employer's Monthly Deposit Due

If your business is subject to monthly deposit rules, by January 15 you must deposit Social Security, Medicare, and withheld income tax for December 2025 electronically. Nonpayroll withholding deposits for December 2025 must also be completed by this date if required. Employers with a deposit liability under $2,500 for a return period may opt for quarterly or annual payments alongside the return.

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January 15 - Key Deadline for Farmers and Fishermen

Farmers and fishermen should pay their estimated tax for 2025 using Form 1040-ES by January 15. Though you have until April 15 to file your 2025 income tax return (Form 1040 or Form 1040-SR), missing the estimated tax payment deadline mandates filing your 2025 return and settling any outstanding tax by March 2, 2026, to circumvent an estimated tax penalty.

Weekends & Holidays:

Should a deadline fall on a Saturday, Sunday, or legal holiday, the due date extends to the next business day, provided it is not a legal holiday.

Disaster Area Extensions:

Areas categorized as disaster zones receive filing extensions. To verify if your area qualifies and to access updated filing dates, visit these resources:

FEMA: https://www.fema.gov/disaster/declarations
IRS: https://www.irs.gov/newsroom/tax-relief-in-disaster-situations

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